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首页> 外文期刊>The Astrophysical journal >A late-time flattening of afterglow light curves
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A late-time flattening of afterglow light curves

机译：余辉光曲线的后期展平

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摘要

We present a sample of radio afterglow light curves with measured decay slopes that show evidence of a flattening at late times compared to optical and X-ray decay indices. The simplest origin for this behavior is that the change in slope is due to a jetlike outflow making a transition to subrelativistic expansion. This can explain the late-time radio light curves for some but not all of the bursts in the sample. We investigate several possible modifications to the standard fireball model, which can flatten late-time light curves. Changes to the shock microphysics, which govern particle acceleration, or energy injection to the shock (either radially or azimuthally) can reproduce the observed behavior. Distinguishing between these different possibilities will require simultaneous optical/radio monitoring of afterglows at late times. [References: 63]
机译：我们提供了具有测量的衰减斜率的无线电余辉光曲线样本，该曲线显示了与光学和X射线衰减指数相比在后期变平的证据。此行为的最简单原因是，坡度的变化是由于射流状流出导致向相对论膨胀的过渡。这可以解释样品中某些但不是全部猝发的后期无线电波曲线。我们研究了对标准火球模型的几种可能的修改，这些修改可以使后期的光曲线变平坦。冲击微观物理学的变化决定了粒子的加速度，或者向冲击（径向或方位角）注入能量可以重现观察到的行为。区分这些不同的可能性将需要在后期同时对余辉进行光学/无线电监控。 [参考：63]

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